sorry is this has been covered already but i'm alittle confused on what transponders will work and what ones won't. i have 2 older amb transponders,the ones with the 3 tabs and i have 1 mylaps that i have had for about 2 yrs. my track says that they will use the new system starting in july. if i exchange my current trans ponders will they work with the old system? and which one or all of my current transponders will need to be updated?